Manifolds on 500HP's.....
 

What is a good but not super expensive replacement for the stock Gil manifolds on 500HP's? Our motors have the original Gils and we want to get some newer ones. We were contemplating headers but I think hey may be a bit to pricey...suggestions please.....

Thanks

CMI Unitops. I had set on my 525SC. Priced about the same as most manifold/riser systems.
http://www.offshoreonly.com/forums/s...d.php?t=156933

Those or a Stainless Marine System.

Also Hardin marine makes some headers and they are called cyclone shortys that work as a replacement for the Gil exhaust

From a performance stand point the good ol' Gil's just can't be beat for a high performance exhaust manifolds. A new set part#420-901180-GB http://www.cpperformance.com/detail.aspx?ID=2578
Suggested list price is 1714.27 our discounted price on these is $1575.00 per pair.

Your best header option would be the "Cyclone" shorty headers. http://www.cpperformance.com/detail.aspx?ID=290
These headers are a direct replacement for the Gil manifolds and will allow you to use your existing tailpipe and sell for $2399.00.

Look at Stainless Marine

Exhaust
 

Captain Chucky

Keith Eickert performance products sell both the Gils and the Hardin Cyclones. I do have a few questions real quick. Are you looking at replacing the manifolds and risers or just manifolds? Have you done any up grades to the 500's? If not are you planning on doing any up grades? If you are going to keep the hp 500s the way they are you really can't go wrong with one or the other but if you want to do any up grades the Cyclones are the way to go. As far as pricing goes the Gil manifolds are $1575.99 for the set and if you want the manifolds and risers they are $2399.99 per set. The Cyclones are $2200.00 for the headers and for the headers and risers it would only be $3495.99. I am here to help any way I can. You can call us at (386) 446-0660 or e-mail me at [email protected].

Sincerely

Tony

ditto

Thanks for the info guys. I do have a set of Stainless Marine manifolds and risers from another engine I bought last year but I was told by an engine builder they are not much better than the stock Gils. Based on his opinion I started looking at CMI.
I am going to check out the unitops now. Thanks for that info Griff.


Chuck

Chuck -

Please email me at [email protected] I tried returning the PM you sent, but my sent folder is full and i cannot clear it or reply. Sorry about the delay.

We can get you into Unitops providing you have a standard bravo exhaust layout for about the same cost as good manifolds and risers. A true header at a manifold price.

All the guys that answered here have very good products. So do not take this as a knock on the competition.

Kirk

Sent you am email Kirk. Thanks.